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Interrupt Controller (INTC)
Chapter 5
Preliminary User’s Manual U17566EE1V2UM00
Figure 5-12
Exception trap processing
(2)
Restore
Recovery from an exception trap is carried out by the DBRET instruction. By
executing the DBRET instruction, the CPU carries out the following processing
and controls the address of the restored PC.
(1) Loads the restored PC and PSW from DBPC and DBPSW.
(2) Transfers control to the address indicated by the restored PC and PSW.
Figure 5-13
illustrates the restore processing from an exception trap.
Figure 5-13
Restore processing from exception trap
Exception trap (ILGOP) occurs
DBPC
DBPSW
PSW.NP
PSW.EP
PSW.ID
PC
restored PC
PSW
1
1
1
00000060H
Exception processing
CPU processing
DBRET instruction
PC
PSW
DBPC
DBPSW
Jump to address of restored PC
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